Need Help Debugging Script/Error in Script - How to add attributes to html table using javascript?

function createhtml(elementname,attr)
{
for(j=0;j<attrs.length;j++)
                        {                            
                             attr1=attr1.split("=")  
                               atr=attr1[0];
//first method
 window['o' + elementname].setAttribute(atr, attr1[1]);  
 //second method                    
 var e=document.getElementById(elementnode)
e. window[atr]= attr1[1]  }  
                            }

e. style.width= attr1[1]

var e=document.getElementById(elementname);
e[atr]= attr1[1];