Thank you for your valuable suggestions.
as for your suggestion i was able to reduce half of the time only,i need reduce 
remaining half time can you help me out in this.
i am using following code, in this till get alert message it is not taking much 
time, after got shortlist of entries also it is taking 30 secs time. 
var bgstring = top.document.getElementById("skeltonString").value;
var bgarray = new Array();
var bgarray1 = new Array();
bgarray = bgstring.split(",");

var bgvar =0; 
var y =0,z=0,bgvar=0; 

for(i=0;i<512;i++)
{
var x =0;
for(var l=0;l<512;l++)
{

if(bgarray[bgvar]==1)
{
bgarray1[z]=x;
bgarray1[z+1]=y;
z=z+2; 
}
bgvar =bgvar+1;
x = x+0.78;
}
y = y+0.78;
}

alert("hi"+bgarray1.length);


var svgobj = svgDocument.getElementById("rect");
for(i=0;i<bgarray1.length;i=i+2)
{ 
var newnode = svgobj.cloneNode(false);
k++;

newnode.setAttribute ('id','bg'+k);
newnode.setAttribute ('x',bgarray1[i]);
newnode.setAttribute ('y', bgarray1[i+1]);
var contents = svgDocument.getElementById ('contents');
newnode = contents.appendChild (newnode);
}

Thanks and Regards
P.Chandra Shaker Reddy


      

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