How to output to dollars?

I can't get the value to output into dollars
for ex. value=2.5; //outputs "$250"

this.getField("hospitaldeduct").value=0
if (this.getField("Combo Box1").value==1)
{
this.getField("hospitaldeduct").value=2.5;
}
if (this.getField("Combo Box1").value==.9)
{
this.getField("hospitaldeduct").value=0;
}
if (this.getField("Combo Box1").value==.8)
{
this.getField("hospitaldeduct").value=0;
}
if (this.getField("Combo Box1").value==.7)
{
this.getField("hospitaldeduct").value=0;
}

thanks!!!