function meretez()
	{
	var balh;
	var mainh;
	var jobbh;
	var minh=500;
	balh=document.getElementById("div_menu").offsetHeight ;
	balh=balh+178;
	mainh=document.getElementById("div_main").offsetHeight ;
	righth=document.getElementById("div_right").offsetHeight ;
	if(mainh<minh && balh<minh && righth<minh)
		{
		document.getElementById("div_main_box").style.height=minh+"px";
		document.getElementById("div_main").style.height=minh+"px";
		document.getElementById("div_menu").style.height=(minh-248)+"px";
		document.getElementById("div_right").style.height=(minh-15)+"px";
		}
		
	else if(mainh>balh && mainh>righth)
		{
		document.getElementById("div_main_box").style.height=mainh+"px";
		document.getElementById("div_main").style.height=mainh+"px";
		document.getElementById("div_menu").style.height=(mainh-248)+"px";
		document.getElementById("div_right").style.height=(mainh-15)+"px";
		}
	else if(righth>balh)
		{
		document.getElementById("div_main_box").style.height=righth+"px";
		document.getElementById("div_main").style.height=righth+"px";
		document.getElementById("div_menu").style.height=(righth-248)+"px";
		document.getElementById("div_right").style.height=(righth-15)+"px";
		}
	else
		{
		document.getElementById("div_main_box").style.height=balh+"px";
		document.getElementById("div_main").style.height=balh+"px";
		document.getElementById("div_menu").style.height=(balh-248)+"px";
		document.getElementById("div_right").style.height=(balh-15)+"px";
		}
	}