var xo, yo;

function startDrag(element) {
    element.class = "dragging"	
    xo = event.clientX
    yo = event.clientY
}


function drag(element) {
     if(element.class == "dragging")
     {
	 	element.style.pixelTop = event.clientY;
	 	element.style.pixelLeft = event.clientX;
	 }
}