var minWidth = 800;
var width=0;
var optimizationOn = false;

if (self.screen) {     // for NN4 and IE4

        width = screen.width;

}else if (self.java) {   // for NN3 with enabled Java

       var jkit = java.awt.Toolkit.getDefaultToolkit();
       var scrsize = jkit.getScreenSize();       
       width = scrsize.width; 
}

if (width > 0 && width <= minWidth){

	optimizationOn = true;
}

function startBlock(type){

	if (optimizationOn){

		document.write("<"+type+" style=\"display: none;\">");
	}else{
		document.write("<"+type+" >");
	}
}

function displayBlock(source){

	if (optimizationOn){

		document.write(source);
	}
}

function notDisplayBlock(source){

	if (!optimizationOn){

		document.write(source);
	}
}