var allHTMLTags = new Array();
function getElementByClass(theClass, marginTop, marginLeft) {

//Create Array of All HTML Tags
var allHTMLTags=document.getElementsByTagName('*');

//Loop through all tags using a for loop
for (i=0; i<allHTMLTags.length; i++) {

//Get all tags with the specified class name.
if (allHTMLTags[i].className==theClass) {


allHTMLTags[i].style.margin = marginTop + 'px ' +marginLeft+ 'px';
}
}
}