Hi everybody.
Regarding the previously posted error message, it's fixed by replacing the '&&' character on the script to '&' Thanks to moderator. But another error message displayed during preview i.e;
Your template could not be parsed as it is not well-formed. Please make sure all XML elements are closed properly.
XML error message: The content of elements must consist of well-formed character data or markup.
I'm not good at all with the computer language make it impossible for me to figure out what else should be done to make the script works on my site. 
BTW, this is the original script I'm trying to use.
Code:
<style>
.shakeimage{
position:relative
}
</style>
<script language="JavaScript1.2">
/*
Shake image script (onMouseover)-
© Dynamic Drive (www.dynamicdrive.com)
For full source code, usage terms, and 100's more DHTML scripts, visit http://dynamicdrive.com
*/
//configure shake degree (where larger # equals greater shake)
var rector=3
///////DONE EDITTING///////////
var stopit=0
var a=1
function init(which){
stopit=0
shake=which
shake.style.left=0
shake.style.top=0
}
function rattleimage(){
if ((!document.all&&!document.getElementById)||stopit==1)
return
if (a==1){
shake.style.top=parseInt(shake.style.top)+rector
}
else if (a==2){
shake.style.left=parseInt(shake.style.left)+rector
}
else if (a==3){
shake.style.top=parseInt(shake.style.top)-rector
}
else{
shake.style.left=parseInt(shake.style.left)-rector
}
if (a<4)
a++
else
a=1
setTimeout("rattleimage()",50)
}
function stoprattle(which){
stopit=1
which.style.left=0
which.style.top=0
}
</script>
It's a script for "shaking image"
Hoping that someone could lend me a hand on this matter.
Thanks
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