function wopen(link,wi,he,sc) {

	var width=wi ; 
	var height=he ;
	var scroll=sc ;
	var l=(screen.availWidth-width)/2;
	var t=(screen.availHeight-height)/2;
        var wincom ;

	wincom=window.open(link ,"oswin","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars="+scroll+",resizable=0,width="+wi+",height="+he+",screenX="+l+",screenY="+t+",left="+l+",top="+t);
	wincom.focus() ;
}