var obj = "";
var list = document.getElementsByTagName("div");
for (var i = 0; i < list.length; i++) {
	if (list[i].className.indexOf("maintext") > -1) {
		obj = list[i];
	}
}
if (obj !="")
{
	//alert(obj.offsetHeight);
	if (obj.offsetHeight < 485){
	obj.style.height='485px';}
	//alert(obj.style.height);
}