// this tests that file must be of certain type 
function testForFileExtensions(myForm,extensions) 
{ 
var objReg; 
var extension; 
var strErrorMsg = "."+extensions[extensions.length-1]; 
var ok = false; 
(extensions.length>1)?strErrorMsg=" or "+strErrorMsg:strErrorMsg+=" "; 


for (i=0;i<extensions.length;i++) 
 { 
 extension = extensions[i]; 
 objReg = "/\."+extension+"$/i.test(myForm.fileName.value)"; 
 if ((eval(objReg))) ok = true; 
 if (i<extensions.length-1) strErrorMsg = "."+extension+", "+strErrorMsg; 
 } 


if (!ok) 
 { 
 alert("Please select a file with extension "+strErrorMsg); 
    myForm.fileName.focus(); 
    return false; 
 } 
return true; 


}