function screenHeight(){
	var scHeight = 0;
	var appVer = navigator.appVersion.toLowerCase();
	var appNum = navigator.appVersion.substring(0,1);
	var appName = navigator.appName;
	var compName = "";

	if (appVer.indexOf("win")!=-1){
		compName="Win";
	}
	else if (appVer.indexOf("mac")!=-1){
		compName="Mac";
	} else {
		compName="?";
	}
	if (appName=="Netscape" && appNum==4){
		scHeight = window.innerHeight;
	}
	else if (appName=="Netscape" && appNum>4){
		scHeight = window.innerHeight;
	}
	else if (appName=="Microsoft Internet Explorer" && appNum>=4 && compName=="Win"){
		scHeight = document.body.clientHeight;
	}
	else if (appName=="Microsoft Internet Explorer" && appNum>=4 && compName=="Mac"){
		scHeight = document.body.clientHeight;
	}
	return scHeight;
}