Actually, you can underline with a different colour. If, for example, you style the <p> tag in one colour and the <span> tag in another, you can then add text-decoration:underline; to the <p> tag. This will then underline everything in the colour of the <p> tag whilst the contents of the <span> tag have a different colour (as defined).
Nevertheless, you should check the ie7 & ie6 stylesheets for text-decoration declarations.
Also, take a look at this mess:
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<p style="BACKGROUND-COLOR: rgb(255,255,255)" align="center"><font style="BACKGROUND-COLOR: #ffffff" face="Times New Roman" color="#0000ff" size="6"><strong>Welcome to Floodcheck ®</strong></font></p>
<p style="BACKGROUND-COLOR: rgb(255,255,255)" align="center"><font color="#0000ff" size="3"><font color="#000000"><font style="BACKGROUND-COLOR: #ffffff" face="Times New Roman"><span style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: "Arial Black""><strong>Your one stop shop, that will help save water,and protect your home/office from water damage due to leaking or burst pipes/hoses taps left on etc.</strong></span></font></font></font></p>
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<p style="TEXT-ALIGN: center" align="center"><font style="BACKGROUND-COLOR: #ffffff"><span><strong>Protection from as little as just £20 that can be fitted in five minutes, by the average handyman without any tools at all….see our MANUAL</strong></span></font><span style="FONT-SIZE: 10pt; COLOR: red; FONT-FAMILY: "Arial Black""><font style="BACKGROUND-COLOR: #ffffff"> <font color="#000000">unit.</font></font>
<p align="center"><font style="BACKGROUND-COLOR: #ffffff"><strong> <span>Just like having a fuse box to check your water supply, and protect your home </span></strong></font><span style="FONT-SIZE: 10pt; COLOR: red; FONT-FAMILY: "Arial Black""><font style="BACKGROUND-COLOR: #ffffff"><strong> </strong></font>
<p align="center"><strong><font style="BACKGROUND-COLOR: #ffffff"> </font><span><font style="BACKGROUND-COLOR: #ffffff" color="#0000ff" size="3">Fitting a Floodcheck® will monitor your water supply, and allow you to turn if off at the flick of a switch or in the event of a leak or any problem it will turn the water supply off automatically.</font></span></strong><font color="#0000ff" size="5"><font size="3"><font color="#000000"><font face="Times New Roman"><font style="BACKGROUND-COLOR: #ffffff"><font color="#0000ff"><strong> </strong></font></font>
<p align="center"><font style="BACKGROUND-COLOR: #ffffff"><strong> <span>Prices include VAT for
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UK orders . Export orders exempt from Vat.Shipping is £7.50 PER ORDER
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UK other shipping prices on application. We offer good discounts for larger orders, and are looking for agents / stockist worldwide...Interested?..</span><font size="2"> </font></strong></font></p>
<p align="center"><font size="2"><font style="BACKGROUND-COLOR: #ffffff"><strong> <span style="FONT-SIZE: 10pt; COLOR: red; FONT-FAMILY: "Franklin Gothic Demi""><span style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: "Franklin Gothic Demi"">Payment can be by Pay Pal, cheque, transfer etc. Contact us for details <span onmouseup="java script:skype_tb_imgOnOff(this,1,'0',true,'');return skype_tb_stopEvents();" class="skype_tb_injection" onmousedown="java script:skype_tb_imgOnOff(this,2,'0',true,'');return skype_tb_stopEvents();" id="softomate_highlight_0" onmouseover="java script:skype_tb_imgOnOff(this,1,'0',true,'');" title="Call this phone number in United Kingdom with Skype: +441621826768" onclick="java script:skype_tb_doRunCMD('call','0',null,0);return skype_tb_stopEvents();" onmouseout="java script:skype_tb_imgOnOff(this,0,'0',true,'');" durex="0" context="01621 826768" iamrtl="0"><span class="skype_tb_nop"> </span><span onmouseup="java script:doSkypeFlag(this,'0',1,1);return skype_tb_stopEvents();" class="skype_tb_imgA_flex" onmousedown="java script:doSkypeFlag(this,'0',2,1);return skype_tb_stopEvents();" id="skype_tb_droppart_0" onmouseover="java script:doSkypeFlag(this,'0',1,1);" title="Skype actions" onclick="java script:skype_tb_SwitchDrop(this,'0','sms=0',true);return skype_tb_stopEvents();" onmouseout="java script:doSkypeFlag(this,'0',0,1);"> <span class="skype_tb_nop"> </span><span class="skype_tb_imgFlag" id="skype_tb_img_f0" style="BACKGROUND-IMAGE: url(file://C:/DOCUME~1/Owner/LOCALS~1/Temp/__SkypeIEToolbar_Cache/e70d95847a8f5723cfca6b3fd9946506/static/famfamfam/GB.gif)"> </span> <span class="skype_tb_nop"> </span></span><span class="skype_tb_imgS" id="skype_tb_img_s0"> </span><span class="skype_tb_injectionIn" id="skype_tb_text0"><span class="skype_tb_innerText" id="skype_tb_innerText0"> 01621 826768 </span></span><span class="skype_tb_imgR" id="skype_tb_img_r0"> <span class="skype_tb_nop"> </span></span></span> <span onmouseup="java script:skype_tb_imgOnOff(this,1,'1',true,'');return skype_tb_stopEvents();" class="skype_tb_injection" onmousedown="java script:skype_tb_imgOnOff(this,2,'1',true,'');return skype_tb_stopEvents();" id="softomate_highlight_1" onmouseover="java script:skype_tb_imgOnOff(this,1,'1',true,'');" title="Call this phone number in United Kingdom with Skype: +447803071001" onclick="java script:skype_tb_doRunCMD('call','1',null,0);return skype_tb_stopEvents();" onmouseout="java script:skype_tb_imgOnOff(this,0,'1',true,'');" durex="0" context="07803 071001" iamrtl="0"><span class="skype_tb_nop"> </span><span onmouseup="java script:doSkypeFlag(this,'1',1,1);return skype_tb_stopEvents();" class="skype_tb_imgA_flex" onmousedown="java script:doSkypeFlag(this,'1',2,1);return skype_tb_stopEvents();" id="skype_tb_droppart_1" onmouseover="java script:doSkypeFlag(this,'1',1,1);" title="Skype actions" onclick="java script:skype_tb_SwitchDrop(this,'1','sms=1',true);return skype_tb_stopEvents();" onmouseout="java script:doSkypeFlag(this,'1',0,1);"> <span class="skype_tb_nop"> </span><span class="skype_tb_imgFlag" id="skype_tb_img_f1" style="BACKGROUND-IMAGE: url(file://C:/DOCUME~1/Owner/LOCALS~1/Temp/__SkypeIEToolbar_Cache/e70d95847a8f5723cfca6b3fd9946506/static/famfamfam/GB.gif)"> </span> <span class="skype_tb_nop"> </span></span><span class="skype_tb_imgS" id="skype_tb_img_s1"> </span><span class="skype_tb_injectionIn" id="skype_tb_text1"><span class="skype_tb_innerText" id="skype_tb_innerText1"> 07803 071001 </span></span><span class="skype_tb_imgR" id="skype_tb_img_r1"> <span class="skype_tb_nop"> </span></span></span> ( non <country-region w:st="on"></country-region>
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uk ) 0044 621 826768 <span onmouseup="java script:skype_tb_imgOnOff(this,1,'2',true,'');return skype_tb_stopEvents();" class="skype_tb_injection" onmousedown="java script:skype_tb_imgOnOff(this,2,'2',true,'');return skype_tb_stopEvents();" id="softomate_highlight_2" onmouseover="java script:skype_tb_imgOnOff(this,1,'2',true,'');" title="Call this phone number in United Kingdom with Skype: +447803071001" onclick="java script:skype_tb_doRunCMD('call','2',null,0);return skype_tb_stopEvents();" onmouseout="java script:skype_tb_imgOnOff(this,0,'2',true,'');" durex="0" context="07803 071001" iamrtl="0"><span class="skype_tb_nop"> </span><span onmouseup="java script:doSkypeFlag(this,'2',1,1);return skype_tb_stopEvents();" class="skype_tb_imgA_flex" onmousedown="java script:doSkypeFlag(this,'2',2,1);return skype_tb_stopEvents();" id="skype_tb_droppart_2" onmouseover="java script:doSkypeFlag(this,'2',1,1);" title="Skype actions" onclick="java script:skype_tb_SwitchDrop(this,'2','sms=1',true);return skype_tb_stopEvents();" onmouseout="java script:doSkypeFlag(this,'2',0,1);"> <span class="skype_tb_nop"> </span><span class="skype_tb_imgFlag" id="skype_tb_img_f2" style="BACKGROUND-IMAGE: url(file://C:/DOCUME~1/Owner/LOCALS~1/Temp/__SkypeIEToolbar_Cache/e70d95847a8f5723cfca6b3fd9946506/static/famfamfam/GB.gif)"> </span> <span class="skype_tb_nop"> </span></span><span class="skype_tb_imgS" id="skype_tb_img_s2"> </span><span class="skype_tb_injectionIn" id="skype_tb_text2"><span class="skype_tb_innerText" id="skype_tb_innerText2"> 07803 071001 </span></span><span class="skype_tb_imgR" id="skype_tb_img_r2"> <span class="skype_tb_nop"> </span></span></span>.</span></span></strong></font></font></p>
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It's causing a javascript errors and is likely the culprit.
It's not an issue with CubeCart!