if(window.ie7){
	//write css link to the html file
	document.write('<link href="so_style.css" rel="stylesheet" type="text/css" />');		
	

}
if(window.ie6){
	//write css link to the html file
	document.write('<link href="so_style.css" rel="stylesheet" type="text/css" />');	
	

}
if(window.khtml){
	//write css link to the html file
	document.write('<link href="so_style_z.css" rel="stylesheet" type="text/css" />');		
	

}
if(window.gecko){
	//write css link to the html file
	document.write('<link href="so_style_z.css" rel="stylesheet" type="text/css" />');		
	

}