How to add attributes to html table using javascript?

[ammu]

I want to create a html table dynamically using javascript.
here the element name and attributes will be passed to the function as shown below.

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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]  } 
                            }

here i tried several methods to create dynamically an attribute which is in bold in the code above.
instead of giving
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e. style.width= attr1[1]

i want to write

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e.'the variable name'=attr1[1]

how to achieve this?