拖曳js

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<div id="f" style=" display:none;position: absolute; width: 645px; height: 150px; background-color: #ccc; top: 150px; left: 200px; z-index: 100; "> <div id="title" class="tbltitle" style="cursor: move; height: 20px; color: #fff;font-size: 12px; padding-top: 5px; padding-left: 3px;"><img src="images/title_layer_yd.gif" align="absmiddle" />请选择职能类别(最多仅能选择5项)<a href="#" style="float:right; padding-right:20px; color:#FFF;" onclick="colseFlow()">[确定]</a> </div> <table id="idBox" class="lightbox" width="100%" border="0" cellpadding="0" cellspacing="0" style="border-bottom:3px solid #ff7300; "> <tr><td height="40px" class="search-sub-font" colspan="4" >计算机/互联网/通信/电子</td></tr> <tr><td height="25" width="161" align="left" valign="middle" class="backgray" style="padding-left:2px;cursor: pointer;" onmouseover="this.className='onmousebackgray'" onmouseout="this.className='backgray';" onclick="#">计算机硬件</td><td height="25" width="161" align="left" valign="middle" class="backgray" 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align="left" valign="middle" class="backgray" style="padding-left:2px;cursor: pointer;" onmouseover="this.className='onmousebackgray'" onmouseout="this.className='backgray';" onclick="#">计算机硬件</td><td height="25" width="161" align="left" valign="middle" class="backgray" style="padding-left:2px;cursor: pointer;" onmouseover="this.className='onmousebackgray'" onmouseout="this.className='backgray';" onclick="#">计算机硬件</td></tr> <tr><td height="25" width="161" align="left" valign="middle" class="backgray" style="padding-left:2px;cursor: pointer;" onmouseover="this.className='onmousebackgray'" onmouseout="this.className='backgray';" onclick="#">计算机硬件</td><td height="25" colspan="3"align="left" valign="middle" class="backgray"></td></tr> <tr><td height="40px" class="search-sub-font">广告/市场/媒体/艺术</td></tr> <tr><td height="25" width="161" align="left" valign="middle" class="backgray" style="padding-left:2px;cursor: pointer;" onmouseover="this.className='onmousebackgray'" 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valign="middle" class="backgray" style="padding-left:2px;cursor: pointer;" onmouseover="this.className='onmousebackgray'" onmouseout="this.className='backgray';" onclick="#">计算机硬件</td><td height="25" width="161" align="left" valign="middle" class="backgray" style="padding-left:2px;cursor: pointer;" onmouseover="this.className='onmousebackgray'" onmouseout="this.className='backgray';" onclick="#">计算机硬件</td><td height="25" width="161" align="left" valign="middle" class="backgray" style="padding-left:2px;cursor: pointer;" onmouseover="this.className='onmousebackgray'" onmouseout="this.className='backgray';" onclick="#">计算机硬件</td></tr> <tr><td height="25" width="161" align="left" valign="middle" class="backgray" style="padding-left:2px;cursor: pointer;" onmouseover="this.className='onmousebackgray'" onmouseout="this.className='backgray';" onclick="#">计算机硬件</td><td height="25" width="161" align="left" valign="middle" class="backgray" style="padding-left:2px;cursor: pointer;" 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