function checkvalue(){
	var x=document.getElementById("ccformvalue").value;
	if(x=="Enter your email address") {
		document.getElementById("ccformvalue").value="";
	}
  return false;
}

sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);


function reCalc(frm)
{
	with(frm)
	{
		if(txtarea.value!='' && txtwd.value!='' && txtht.value!='')
		{
			var tile_area_m2 = (1/(txtht.value*txtwd.value));
			var area_1sqm = 10000*tile_area_m2;

			document.getElementById('total_tiles_psqm').innerHTML = Math.ceil(area_1sqm);
			var total_area = Math.ceil(txtarea.value*area_1sqm);
			document.getElementById('total_tiles').innerHTML = total_area;
		}
	}
}