var submit = false;

window.onload = function(){	
	if(document.createElement || document.childNodes){				
		var ellset = document.getElementsByTagName("input");
		buttonell = ellset[ellset.length - 1];	
		buttonell.onclick = function(){
			if(!submit){				
				submit = true;				
				this.className = "disabledbutton";				
				document.getElementsByTagName("form")[0].submit();}}}}