function headInputFocus(obj) {
	obj.value="";
	obj.style.color = "#09f";
}

function headInputBlur(obj, str) {
	if (obj.value=="") {
		obj.value=str;
		obj.style.color = "#fff";
	}
}

function doSize(){
var bheight = $(window).height();
var c = $("#mainContent");
var offset = c.offset();
bheight = bheight-(offset.top);
$("#mainContent").height(bheight);

};