function changewidth(){
	
	var annsize;
	var itsize;
	var itsheight;
	var rightmargin;
	
	if (screen.width==1280){
		itsize=22;
        annsize=22;
		itsheight=5; 
		rightmargin=3;
	}
	if (screen.width==1152){
		itsize=25;
        annsize=25;
		itsheight=5; 
		rightmargin=1;
	}
	else if (screen.width==1024){
		itsize=30;
        annsize=30;
		itsheight=5;
		rightmargin=3;
	}
	else if (screen.width==800){
		itsize=35;
        annsize=0;
		itsheight=5;
		rightmargin=1;
	}
	
	
	document.getElementById("main").style.marginLeft=itsize +"%";
	document.getElementById("main").style.marginRight=rightmargin +"%";
	document.getElementById("show_header").style.height=itsheight +"em";
    //document.getElementById("announce").style.marginRight=rightmargin +"%";
	//document.getElementById("announce").style.marginLeft=annsize +"%";
    
	
}