function get_browser()
{
var bver=null;
if(document.layers)
{bver='nn4';
}
else if(document.all)
{
if(window.opera)
	{bver='opera';
	}
else
	{bver='ie4';
	}
}
else if(document.getElementById)
{
if(navigator.userAgent.indexOf('gecko')>-1)
	{bver='mozilla';
	}
else
	{bver='nn6';
	}
}
return bver;
}



function preloadImg(file) {
 	img = new Image();
	img.src = file;
}






function get_document_object(ElName)
{
//alert('elname:'+ElName);
if(ElName=="")
	{return null;
	}
if(ElName.indexOf('-')>-1)
	{return null;
	}
var El;
if((BROWSER_ID=='ie4')||(BROWSER_ID=='opera'))
{
El=eval("document.all."+ElName);
}
if((BROWSER_ID=='mozilla')||(BROWSER_ID=='nn6'))
{
El=document.getElementById(ElName);
}
return El;
}