visual studio 2008 showing html error on debugging respect to content.js file

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Visual-Studio

hello!
I am doing work in asp.net with c#.
When i debug my project i got an error of htmlfile in content.js file
What should i do to remove that error.
That html error show msg:-> "htmlfile:unknown runtime error."
and it points errror at following code::->

styleTag.innerHTML =
                '.emote_img { width:15px; height:16px; margin: 3px 4px 3px 4px; opacity: .9; -moz-opacity: 0.9; filter: alpha(opacity=90); filter: "alpha(opacity=90)";}'+
                '.emote_img:hover { border-radius: 2px; border: 2px solid #f9f9f9; border-top-width:1px; border-bottom-width:1px; background-color:#f9f9f9; margin: 2px 2px 2px 2px; opacity: 1; -moz-opacity: 1; filter: alpha(opacity=100); filter: "alpha(opacity=100)"; }'+
                '.chat_tab_emot_bar { max-height: 44px; padding-top: 0; padding-bottom: 0; line-height: 16px; padding-left: 2px; background:#eee none repeat scroll 0 0; border-style: solid; border-width: 0px 0px 1px 0px; border-color: #C9D0DA; position: static; }'+
                '.chat_arrow { opacity: .75; -moz-opacity: 0.75; filter: alpha(opacity=75); filter: "alpha(opacity=75)"; cursor: pointer; position: absolute; top: -25px; right: 70px; background: url("//dd50w6dldw3pf.cloudfront.net/onoff.png") 50% no-repeat; height: 24px; width: 18px; }'+
                '.chat_arrow:hover { opacity: 1; -moz-opacity: 1; filter: alpha(opacity=100); filter: "alpha(opacity=100)"; };'
                ;