//global variables that can be used by ALL the function son this page. 
var inputs; 
var imgFalse = '/portal/images/box_unchecked.gif'; 
var imgTrue = '/portal/images/box_checked.gif'; 

//this function runs when the page is loaded, put all your other onload stuff in here too. 
function init() { 
    replaceChecks(); 
} 

function replaceChecks() { 
     
    //get all the input fields on the page 
    inputs = document.getElementsByTagName('input'); 

    //cycle trough the input fields 
    for(var i=0; i < inputs.length; i++) { 

        //check if the input is a checkbox 
        if(inputs[i].getAttribute('type') == 'checkbox') { 
			
             
            //create a new image 
            var img = document.createElement('img'); 
             
            //check if the checkbox is checked 
            if(inputs[i].checked) { 
                img.src = imgTrue; 
            } else { 
                img.src = imgFalse; 
            } 

            //set image ID and onclick action 
            img.id = 'checkImage'+i; 
            //set image 
			
			if (inputs[i].getAttribute('name') == 'selectAll') {
				 img.onclick = new Function('CheckAllNew('+i+')'); 
			}
			else {
            img.onclick = new Function('checkChange('+i+')'); 
			}
			
            //place image in front of the checkbox 
            inputs[i].parentNode.insertBefore(img, inputs[i]); 
             
            //hide the checkbox 
            inputs[i].style.display='none'; 			
        } 
    } 
} 


function CheckAllNew(i) { 
	
     if(inputs[i].checked) {         
		for(var j=0; j < inputs.length; j++) { 
			if(inputs[j].getAttribute('type') == 'checkbox') { 
				inputs[j].checked = ''; 
        		document.getElementById('checkImage'+j).src=imgFalse; 
			}
		}								
    }
	else { 
		for(var j=0; j < inputs.length; j++) { 
			if(inputs[j].getAttribute('type') == 'checkbox') { 
        		inputs[j].checked = 'checked'; 
        		document.getElementById('checkImage'+j).src=imgTrue; 
			}
    	}
	}
} 


//change the checkbox status and the replacement image 
function checkChange(i) { 

    if(inputs[i].checked) { 
        inputs[i].checked = ''; 
        document.getElementById('checkImage'+i).src=imgFalse; 
		if (document.getElementById('Rate')){
		 document.getElementById('Rate').value='0.00'; 
		 }
    } else { 
        inputs[i].checked = 'checked'; 
        document.getElementById('checkImage'+i).src=imgTrue;
		if (document.getElementById('Rate')){
		 document.getElementById('Rate').value='75.00'; 
		 }
		
    } 
} 

window.onload = init;