jquery给height拼接动态变量

var sizeLength = "${list.size()}";
        if(sizeLength==''){
            sizeLength=0;
        }
        sizeLength=400*sizeLength+200+"px;";
        sizeLength="height:"+sizeLength;
      //  parent.document.getElementById("Main${toolId}").style.height="+sizeLength+";
        parent.$('#Main${toolId}').attr('style',sizeLength);