function eBikeMaxCheck()
{
    var maxSelection = 0;      
    for(var i=0; i < document.comparison.compare.length; i++)
    {
        
        if(document.comparison.compare[i].checked)
        {
            document.comparison.compare.disabled=false;            
            maxSelection++;            
            if (maxSelection > 4)
            {
				document.comparison.compare.disabled=true;
				document.comparison.compare[i].checked = document.comparison.compare[i].unchecked;
                alert("Maximum 4 models can be compared at a time")
            }
        }
    }
}

function ValidateForm()
{
	len = document.comparison.compare.length;
	var noOfBikes = 0;
	for( var i=0 ; i<len ; i++) 
	{
		if (document.comparison.compare[i].checked ) 
		{
			noOfBikes++;
		}
	}
	if (noOfBikes>=2 && noOfBikes<=4 ){ return true; }
	alert("Minimum two  models should be selected to compare.");
	return false;
}