//check size has been selected when added to cart
var check_size=function(){
	var fail=true;
	if(window.document.forms[0].size){
		for(i=0;i<window.document.forms[0].size.length;i++){
			if(window.document.forms[0].size[i].checked==true)fail=false;
		}
		if(fail==true){
			alert("Please select your size");
			return false;
		}
		else{
			return true;
		}
	}
}